package com.ruanjian.reggie.controller;

import com.ruanjian.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file 是一个临时文件


        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String s = UUID.randomUUID().toString();
        String newFileName=s+suffix;
        File file1 = new File(basePath);
        if(!file1.exists()){
            file1.mkdirs();
        }

        try {
//            file.transferTo(new File(basePath + "hello.jpg"));
            file.transferTo(new File(basePath + newFileName));

        } catch (IOException e) {
            e.printStackTrace();
        }

        log.info(file.toString());
        return R.success(newFileName);
    }


    /**
     * 文件的下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void downLoad(String name, HttpServletResponse response){
        //输入流，通过输入流读入文件
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes= new byte[1024];
            while ((len=fileInputStream.read(bytes)) !=-1 ){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

        //输出流，通过输出流将文件写回浏览器，在浏览器展示图片


    }
}
